US20080284415A1 - Piston stroke counting device - Google Patents
Piston stroke counting device Download PDFInfo
- Publication number
- US20080284415A1 US20080284415A1 US12/120,869 US12086908A US2008284415A1 US 20080284415 A1 US20080284415 A1 US 20080284415A1 US 12086908 A US12086908 A US 12086908A US 2008284415 A1 US2008284415 A1 US 2008284415A1
- Authority
- US
- United States
- Prior art keywords
- sensor
- piston
- support
- magnet
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000696 magnetic material Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000005355 Hall effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
- G01D5/147—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0207—Number of pumping strokes in unit time
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0207—Number of pumping strokes in unit time
- F04B2201/02071—Total number of pumping strokes
Definitions
- the present invention relates to a piston stroke counting device.
- the technical aim of the present invention is therefore to provide a piston stroke counting device by which the stated technical drawbacks of the known art are eliminated.
- an object of the invention is to provide a device which is very reliable and which is specifically formed from components not subject to wear.
- Another object of the invention is to provide a device of very small dimensions and low production costs.
- a further object of the invention is to provide a device which can also be used in cylinders in which high or very high pressures (up to 1000 bars and more) are used.
- FIG. 1 is a schematic view of a device according to the present invention
- FIGS. 2 and 3 show a schematic section through a device of the invention with the piston in a position close to and respectively far from a magnetic field sensor.
- these show a stroke counting device, indicated overall by the reference numeral 1 , for a piston sliding within a cylinder.
- the figures show the device 1 applied to a fluid measurement/division device presenting a cylinder 2 within which a piston 3 slides.
- the device 1 comprises a support 5 (facing the interior of the cylinder 2 ) housing a magnet 6 which generates a magnetic field (indicated by 7 in FIG. 1 ).
- the support 5 also houses a sensor 9 in the form of a Hall sensor, i.e. a sensor which by utilizing the Hall effect is able to sense the intensity of the magnetic field within which it is immersed.
- a sensor 9 in the form of a Hall sensor, i.e. a sensor which by utilizing the Hall effect is able to sense the intensity of the magnetic field within which it is immersed.
- Passage of the piston 3 into a position corresponding with the magnet 6 causes a disturbance in the magnetic field, which is sensed by the sensor 9 , to indicate a stroke of the piston 3 .
- the support 5 is made of a non-magnetic material (preferably non-magnetic steel), whereas the cylinder 2 can be made of magnetic material (such as steel) or non-magnetic material; the piston 3 is made of a magnetic material (steel).
- the support 5 is provided with a connector 10 connected to the sensor 9 and connectable to a PLC; in this manner the signals sensed by the sensor 9 can be transmitted to the management and/or control PLC.
- the magnet 6 and sensor 9 are both connected to a printed circuit 11 provided with suitable connections (not shown) to the connector 10 ; in this manner all the connections between the various components can be made easily and reliably.
- the sensor 9 is disposed in a position closer to a cylinder 2 closing wall 15 of the support 5 than the magnet 6 .
- This printed circuit 11 (together with the magnet 6 and sensor 9 ) is inserted into a chamber 16 formed in the support 5 ; the chamber 16 is accessible from the outside through an aperture closed by a closure element 17 .
- the closure element 17 carries the connector 10 and is secured to the support 5 for example by screws.
- the support 5 consists of a plug arranged to close one end of the cylinder 2 .
- the plug 5 does not present components directly facing the cylinder interior and the thickness of the wall 15 can be chosen large, the plug 5 (and hence the device which it supports) can be used together with a cylinder 2 in which high or very high pressure, up to or greater than 500-1000 bars, is present.
- the Hall sensor 9 senses the intensity of the magnetic field in which it is immersed and feeds a first signal indicative of this intensity to the control PLC via the connector 10 .
- the Hall sensor 9 senses that the magnetic field intensity has been modified by the cylinder 3 and is thus different from that sensed in the configuration of FIG. 3 , to feed to the PLC a second signal indicative of the measurement effected.
- the PLC (by means of software stored in it) can associate the piston position with each signal and is able to determine the number of strokes of the piston 3 by measuring the number of first signal-second signal variations.
- the device of the invention is particularly advantageous as it can also be used at very high pressure and is not subject to wear.
- the device can be integrated into a cylinder plug.
Abstract
Description
- The present invention relates to a piston stroke counting device.
- Reference will be made hereinafter in particular to a fluid measurement and/or division device, however the device of the invention can be conveniently used each time the number of strokes of a piston sliding within a cylinder is to be counted.
- Currently existing devices for counting the strokes of a piston sliding within a cylinder are provided with a rod connected to the piston; the rod cooperates with a mechanical proximity sensor which senses its movements and then operates a device for counting the piston strokes.
- However these traditional devices present numerous drawbacks including, in particular, the poor reliability of the proximity sensors.
- In this respect, these tend to wear with use and are no longer able to provide correct measurements.
- Moreover mechanical proximity sensors are of large dimensions and very high cost; this influences the dimensions and cost of traditional piston stroke counting devices, which are very large and costly.
- In the case of cylinders operating under high or very high internal pressure (for example 500, 1000 bars or more), traditional devices with mechanical proximity sensors cannot be used because of the poor mechanical strength of the sensors themselves; in practice, devices using mechanical proximity sensors can be used up to internal cylinder pressures of 10-15 bars.
- The technical aim of the present invention is therefore to provide a piston stroke counting device by which the stated technical drawbacks of the known art are eliminated.
- Within the scope of this technical aim, an object of the invention is to provide a device which is very reliable and which is specifically formed from components not subject to wear.
- Another object of the invention is to provide a device of very small dimensions and low production costs.
- A further object of the invention is to provide a device which can also be used in cylinders in which high or very high pressures (up to 1000 bars and more) are used.
- The technical aim, together with these and other objects, are attained according to the present invention by a piston stroke counting device in accordance with
claim 1. - Other characteristics and advantages of the invention are defined in the subsequent claims.
- Further characteristics and advantages of the invention will be more apparent from the description of a preferred but non-exclusive embodiment of the device of the invention, illustrated by way of non-limiting example in the accompanying drawings, in which:
-
FIG. 1 is a schematic view of a device according to the present invention; -
FIGS. 2 and 3 show a schematic section through a device of the invention with the piston in a position close to and respectively far from a magnetic field sensor. - With reference to said figures, these show a stroke counting device, indicated overall by the
reference numeral 1, for a piston sliding within a cylinder. - The figures show the
device 1 applied to a fluid measurement/division device presenting acylinder 2 within which apiston 3 slides. - The
device 1 comprises a support 5 (facing the interior of the cylinder 2) housing amagnet 6 which generates a magnetic field (indicated by 7 inFIG. 1 ). - The
support 5 also houses asensor 9 in the form of a Hall sensor, i.e. a sensor which by utilizing the Hall effect is able to sense the intensity of the magnetic field within which it is immersed. - Passage of the
piston 3 into a position corresponding with themagnet 6 causes a disturbance in the magnetic field, which is sensed by thesensor 9, to indicate a stroke of thepiston 3. - Advantageously, the
support 5 is made of a non-magnetic material (preferably non-magnetic steel), whereas thecylinder 2 can be made of magnetic material (such as steel) or non-magnetic material; thepiston 3 is made of a magnetic material (steel). - The
support 5 is provided with aconnector 10 connected to thesensor 9 and connectable to a PLC; in this manner the signals sensed by thesensor 9 can be transmitted to the management and/or control PLC. - The
magnet 6 andsensor 9 are both connected to a printedcircuit 11 provided with suitable connections (not shown) to theconnector 10; in this manner all the connections between the various components can be made easily and reliably. - In the printed
circuit 11 thesensor 9 is disposed in a position closer to acylinder 2closing wall 15 of thesupport 5 than themagnet 6. - This printed circuit 11 (together with the
magnet 6 and sensor 9) is inserted into achamber 16 formed in thesupport 5; thechamber 16 is accessible from the outside through an aperture closed by aclosure element 17. - In the embodiment shown in the figures, the
closure element 17 carries theconnector 10 and is secured to thesupport 5 for example by screws. - Preferably, the
support 5 consists of a plug arranged to close one end of thecylinder 2. - Advantageously, as the
plug 5 does not present components directly facing the cylinder interior and the thickness of thewall 15 can be chosen large, the plug 5 (and hence the device which it supports) can be used together with acylinder 2 in which high or very high pressure, up to or greater than 500-1000 bars, is present. - The operation of the device of the invention is apparent from that described and illustrated, and is substantially the following.
- When the
piston 3 is in a position distant from the plug 5 (FIG. 3 ) the magnetic field assumes a predetermined configuration; TheHall sensor 9 senses the intensity of the magnetic field in which it is immersed and feeds a first signal indicative of this intensity to the control PLC via theconnector 10. - When the
piston 3 comes into proximity with the plug 5 (FIG. 2 ), as it is made of magnetic material it influences the magnetic field generated by themagnet 6, to generate a disturbance and modify its lines of force. - The
Hall sensor 9 senses that the magnetic field intensity has been modified by thecylinder 3 and is thus different from that sensed in the configuration ofFIG. 3 , to feed to the PLC a second signal indicative of the measurement effected. - The PLC (by means of software stored in it) can associate the piston position with each signal and is able to determine the number of strokes of the
piston 3 by measuring the number of first signal-second signal variations. - It has been found in practice that the device of the invention is particularly advantageous as it can also be used at very high pressure and is not subject to wear.
- Moreover, as the components used are very small, the device can be integrated into a cylinder plug.
- The device conceived in this manner is susceptible to numerous modifications and variants, all falling within the scope of the inventive concept; moreover all details can be replaced by technically equivalent elements.
- In practice the materials used and the dimensions can be chosen at will according to requirements and to the state of the art.
Claims (10)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2007A1006 | 2007-05-18 | ||
IT001006A ITMI20071006A1 (en) | 2007-05-18 | 2007-05-18 | DEVICE FOR COUNTING THE RACES OF A PISTON |
ITMI2007A001006 | 2007-05-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20080284415A1 true US20080284415A1 (en) | 2008-11-20 |
US7688065B2 US7688065B2 (en) | 2010-03-30 |
Family
ID=39708867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/120,869 Active US7688065B2 (en) | 2007-05-18 | 2008-05-15 | Piston stroke counting device |
Country Status (10)
Country | Link |
---|---|
US (1) | US7688065B2 (en) |
EP (1) | EP1992819B1 (en) |
CN (1) | CN101308040B (en) |
AT (1) | ATE465345T1 (en) |
DE (1) | DE602008001025D1 (en) |
DK (1) | DK1992819T3 (en) |
ES (1) | ES2342132T3 (en) |
IT (1) | ITMI20071006A1 (en) |
PL (1) | PL1992819T3 (en) |
PT (1) | PT1992819E (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103752797A (en) * | 2013-12-25 | 2014-04-30 | 苏州三基铸造装备股份有限公司 | Direct reading type injection control system |
CN103983178B (en) * | 2014-05-22 | 2017-05-17 | 无锡威孚高科技集团股份有限公司 | Proximity type timing sensor using magnetism principle |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3453937A (en) * | 1967-09-14 | 1969-07-08 | Lionel Pacific Inc | Hydraulic actuator with proximity sensor of locked condition |
US5909116A (en) * | 1996-03-29 | 1999-06-01 | Samsung Heavy Industries Co., Ltd. | Structure for mounting actuating rod stroke sensor to hydraulic cylinder |
US7259553B2 (en) * | 2005-04-13 | 2007-08-21 | Sri International | System and method of magnetically sensing position of a moving component |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK195886A (en) * | 1986-04-29 | 1987-10-30 | Niels Hvilsted | WORKING CYLINDER WITH STAMP AND WITH A MAGNETIC DEVICE FOR DETERMINING A STAMP POSITION |
JPS6431002A (en) * | 1987-07-28 | 1989-02-01 | Ckd Controls | Detecting device of position of piston of hydropneumatic cylinder |
DE20003631U1 (en) * | 2000-02-29 | 2000-08-17 | Kuhnke Gmbh Kg H | Device for locating a movable body in a given space |
-
2007
- 2007-05-18 IT IT001006A patent/ITMI20071006A1/en unknown
-
2008
- 2008-05-12 DK DK08156037.7T patent/DK1992819T3/en active
- 2008-05-12 PL PL08156037T patent/PL1992819T3/en unknown
- 2008-05-12 EP EP08156037A patent/EP1992819B1/en active Active
- 2008-05-12 DE DE602008001025T patent/DE602008001025D1/en active Active
- 2008-05-12 AT AT08156037T patent/ATE465345T1/en active
- 2008-05-12 PT PT08156037T patent/PT1992819E/en unknown
- 2008-05-12 ES ES08156037T patent/ES2342132T3/en active Active
- 2008-05-15 US US12/120,869 patent/US7688065B2/en active Active
- 2008-05-16 CN CN200810096394XA patent/CN101308040B/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3453937A (en) * | 1967-09-14 | 1969-07-08 | Lionel Pacific Inc | Hydraulic actuator with proximity sensor of locked condition |
US5909116A (en) * | 1996-03-29 | 1999-06-01 | Samsung Heavy Industries Co., Ltd. | Structure for mounting actuating rod stroke sensor to hydraulic cylinder |
US7259553B2 (en) * | 2005-04-13 | 2007-08-21 | Sri International | System and method of magnetically sensing position of a moving component |
Also Published As
Publication number | Publication date |
---|---|
EP1992819B1 (en) | 2010-04-21 |
EP1992819A1 (en) | 2008-11-19 |
DE602008001025D1 (en) | 2010-06-02 |
PL1992819T3 (en) | 2010-09-30 |
CN101308040B (en) | 2011-09-14 |
ITMI20071006A1 (en) | 2008-11-19 |
CN101308040A (en) | 2008-11-19 |
US7688065B2 (en) | 2010-03-30 |
PT1992819E (en) | 2010-06-22 |
ATE465345T1 (en) | 2010-05-15 |
DK1992819T3 (en) | 2010-08-02 |
ES2342132T3 (en) | 2010-07-01 |
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AS | Assignment |
Owner name: SUNBIRD INVESTMENTS LIMITED, UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DIVISI, WALTER;REEL/FRAME:020949/0808 Effective date: 20080508 Owner name: SUNBIRD INVESTMENTS LIMITED,UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DIVISI, WALTER;REEL/FRAME:020949/0808 Effective date: 20080508 |
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Owner name: DROPSA S.P.A.,ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUNBIRD INVESTMENTS LIMITED;REEL/FRAME:023894/0012 Effective date: 20091218 Owner name: DROPSA S.P.A., ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUNBIRD INVESTMENTS LIMITED;REEL/FRAME:023894/0012 Effective date: 20091218 |
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